CASRV control program commands that are received from a console source through the z/OS MODIFY/STEP interface are attached as separate independent job-step tasks. These commands execute asynchronously in relation to each other and their owning server application. Multiple commands originating from varying MCS console sources can be actively executing at any point in time.
Commands that are received through an internal command source execute synchronously with other commands received from an internal command source. Furthermore, internal commands are guaranteed to execute in the order that they were queued for processing in first in, first out order. This synchronous, first in, first out order processing of internal commands is required to support the initialization statement like behavior of commands that are received through an internal command source. Commands that are received through the z/OS MODIFY/STOP interface continue to execute asynchronously in relation to the internally received commands.
The READCMDS command can be used with the SYNC keyword to control whether to schedule commands synchronously.
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